Having such an addition in one's description surely is nice and kind and all - and to recommend!
But of course not everyone checks descriptions, not even for the last sentence in cases.
Also one should be aware of not everyone is wanting to roleplay, hence I always felt like having to make sure the other one's reaction, if insulted or annoyed, is indeed IC. So I ended up in tells with many people, debating and whatnot.
And as I said I kind of modified that char in the end, softer, politer, since I was more busy OOCly talking to people when playing that char, than actually playing that char. Was tedious.
In my eyes, with the only vaguely defined, hybridal state of Planeshift, where roleplaying is nothing you have to, or should, get into, playing controverse characters always will cause hassle and trouble, of that sort that always may leave doubts if the other player is a roleplayer now, is he feeling offended or not etc. - at least if you care at all that is, of course.
EDIT:
I havent gone through the Tutorial as of late, so perhaps there may be something similar now. If thats not the case:
How about adding a note, not to say a warning, that characters may cross showing impolite or rude manners? Kind of in that part where it comes to character-choice, question if one plans to play an evil char, and advices to be polite to others OOCly?